Molding apparatus.



MOLDING APPAR APPLICATION FILED E Esz'isented Dec. 29, 31914,

2 SHEETS-SHEET l.

E. H. MUMFURD.

MOLDING APPARATUS.

APP-LIOATION FILED JAN. 30, 1914.

Patented De'o. 29, 1914.

Lmaw.

2 SHEETS-SHEET 2.

y of which r pressure supply.

EDGAR H. MUMFOBD, 0F PLAINFIELD, NEW JERSEY.

MOLDING APPARATUS.

1,122.4ldn- Specification of Letters Patent. Patented De 29 1%14 Application filed January 30, 1914. Serial No. 815,442.

-ample as jolt ramming machines, squeezers and the like. Among the primary objects of the invention are the provision of an improved arrangement of guide means for molding machines which makes it possible to greatly simplify and cheapen the construction of the cylinder and the plunger, or their equivalents; the provision of improved plunger guide means for maintaining the plunger central in the cylinder in which it operates; and the provision of improved plunger guide means which is capable of adjustment to compensate for wear. and which, at the same time, automatically maintains the plunger in proper alinemcnt regardless of the amount of adjustment made. I

My invention further contemplates an improved guide means of the character described which is readily accessible and simple in construction, and which provides a novel and effective means for securing lubrication of the moving parts.

The foregoing together with such other objects as may hereinafter appear, or are in cident to my invention, 1 attain by means of a construction, the preferred embodiment T have illustrated in the accompanying drawings, whereinl is a horizontal section taken hrough a j lt ramming machine embodying my invci in on too line l-l of Fig. 2; and is a vertical ection through the machine on the line ll-ll of Fig. l, and Fig. is a side elevation of one of the guide members.

The machine comprises the usual base casting 7 to which is secured the cylinder 8 within which the plunger 9 reciprocates. lilouuted in the side of the lease 7 is a block ii) in which is carried a valve mechanism (not shown) adapted to control the fluid T he bore of the cylinder at the top is considerably increased by err larging the upper portion of the cylinder into the form of a cupped head 11. The upper portion 12 of the plunger 9 is of a polygonal shape, and I prefer to make it square with the corners beveled off. The upper end of the squared portion 12 of the plunger is provided with a flange 13 to which the mold table 14 is secured by the bolts 15. The plunger is guided by a plurality of gibs or guide members 16 which are mounted in the cupped head 11 and rest freely on the bottom thereof and which engage the sides of the squared portion 12. In the embodiment shown, I employ four gibs which are diagonally disposed and of which each engages two sides of the squared portion adjacent to a beveled corner, but it is 'so constructed as to clear the beveled c ner, so that the gibs can move in u; plunger as wear takes place. The maintained in engagement with the the plunger by a means preferahl" form of a gland 17 which is threa the cupped head 11 of the cylinder. engaging faces of the gibs and gland a positely inclined so that when the turned down, the gibs will'be mo wardly on the plunger. It will be clear aconsiderable range of adjustment is vided by the gland 1 7, and it will also he noted that the construction is such that the plunger will always be maintained central in the cupped head of the cylinder. By threading the, gland into the head, the gland descends squarely, which also tends to secure and maintain proper alinement of the parts regardless of the change in the relative position of the parts which takes place when adjustment is made.

One of the advantages incident to the construction resides in the fact that the greater part of the machining of the cylinder and plunger, which is necessary in the.

usual construction employed in molding chines, is done away with. It is only necessary to machine the cylinder and plunger adjacent to the bottom portions thereof for a distance slightly greater than the length of the stroke of the plunger, and to machine a portion of the squared end of the plunger. In other words it is necessary only to support the plunger at the ends thereof and arrangement affords a simple and efiective means for accomplishing this.

In order to protect the joint between gland and the-gibs I secure an annular ring to the top oft-he gland in such manner as to project inward covering the joint. The ring, which I- have designated by the numeral 1-8, is detachably secured to the gland by means of screws 19, and serves to retain oll soaked'waste in the annular space above the gib's and between the gland and the squared end of the plunger. The oil gravi-' head 11 and the, gibs prevent rotation of top and is also provided with a the plunger. The gland 17 is flanged at the lurality of lugs 22 by means of which the g and can be readily. turned. Rotation of the gland with respect to the head 11 is prevented by means of screws 23 which are removed when it is desired to adjust the gland to take up wear.

Because of the vibration or shuddering of the plungers it has been customary to have the plunger bear substantially throughout its lengthen the interior of the cylinder, in

order that the plunger may be adequately supported. In jolting machines of the type shown, the vibrationor-shuddering occurs largely at the top, particularly where the impact is at the bottom of the plunger. By my construction it is-necessary to provide bearing surfaces only at the top and bottom of the plunger, and my improved divided 7 guide means affords a bearing for the top of the plunger. which is readily adjusted to compensate for the increased wear incident to the shuddering of the plunger It will be obvious that changes can be made in structure without departing from the spirit of my invention. What I claim is:

1." In sand molding apparatus, the combination of a relatively movable cylinder member and a plunger member, and means for guidingv one of the members comprising a plurality of gibs concentric with the other member and adapted to move radially with respect to said first member.

2. In sand molding apparatus, the combination of a relatively movable cylinder member and a plunger member, means for guiding one of the members comprising a plurality of gibs adapted to moye radially with respect to said member and concentric with the other member, and a common means for shifting the radial position'of the be 3. in sand molding apparatus, the combination of a relatively nuin'able cylinder member and a plunger mer ber, means for aiding one oi the memhes comprising a plurality of gibs concentri'c with s aidmemher and adapted to move radially with respect to said member, and means for simulta-Eeously shifting the radial position of the g1 s.

In sand molding apparatus, the combination of a cylinder, a plunger reciproeatingx in said cylinder, and means forguide plunger comprising a plurality of ing t gibs interposed between the cylinder and the plunger and adapted to move radially inward on the plunger to take up wear.

5. In sandmolding apparatus, the combination of a cylinder, a plunger reciprocating in said cylinder, means, fol-guiding the plunger comprising a pluralityof gibs interposed between the cylinder andnplunger and. concentric with the former and adapted to move radially inward on the plunger, and means for moving the gibs inwardly.

6. In sand molding apparatus, the combination of a cylinder, a plunger reciprocating in said cylinder, means for guiding the plunger comprising a plurality of gibs interposed between the cylinder and plunger and concentric with the latter and adapted to move radially inward-on the plunger, and an annular wedge member interposed between the gibs and the cylinder for shifting the radial position of the gibs.

In sand molding apparatus, the com bination of a cylinder, a, plunger recipro-' eating in said cylinder, means -for guiding the plunger comprising a plurality of gibs interposed between the cylinder and plunger and concentric with the latter and adapted to move radially inward on the plunger, and wedging means for the radial position of the gibs.

8. In sand moldingapparatua'the combiriation'of a cylinder, a plunger therein havmg a polygonal portion, and a plurality of gibsconcentric with the cylinder and engaging the sides of the polygonal portion.

9. In sand molding apparatus, the combination of a cylinder, a plunger therein having a polygonal portion, a plurality of shifting gibs concentric with the cylinder and en-,

gaging the sides of the polygonal ortion, and means for preventing the gibs rom revolving in the cylinder.

10. In sand-molding apparatus, the com bination of a cylinder having a cupped head, a plunger in the cylinder having a polygonal portion adjacent to said cupped head, a plurality of gibs engaging the polygonal portion, and a gland threaded into the head'and engaging the outer faces of the ibs.

b 11:. In sand molding apparatus,-the combination of a cylinder member and a plum ger member, one being movable relative to the other, and means for guiding one of said members and preventing rotation of said member with respect to the other comprising a plurality of gibs engaging said member and movable radially with respect to said member.

12. In sand moiding apparatus, the combination of acylinder, 2 plunger reciproeating therein, and a divided circumferential guide means for the plunger interposed between the cylinder and the plunger, the members of which engagethe plunger and are free to move radially inward on the plunger.

13. In sand molding apparatus, the comees bination of a cylinder membev member, and a Viv led cii guickv eans e-i ans- 0; ni RENE? u beau-111g in o sher meinb able iii-Lady i bQl" ti m in e Signet} my name in the subscpd witnesses.

EDGAR he saw 

